Answer: When you create a document in Microsoft Publisher or any desktop publishing program, in order for others to open and view the file they would normally have to have the same program. If they don't, there are ways you can convert your creation to a format that others can use.
For other uses, see Epidemiology (disambiguation). Epidemiology is the study and analysis of the patterns, causes, and effects of health and disease conditions in defined populations. It is the cornerstone of public health, and shapes policy decisions and evidence-based practice by identifying risk factors for disease and targets for preventive healthcare.
All findings must relate to a defined population. A key feature of epidemiology is the measurement of disease outcomes in relation to a population at risk. The population at risk is the group of people, healthy or sick, who would be counted as cases if they had the disease being studied.